The amount of a E3 ubiquitin-protein ligase RNF13 (human) when measured in cerebrospinal fluid. The trait is level of E3 ubiquitin-protein ligase RNF13 (human) in cerebrospinal fluid (OBA_2056167, an Ontology of Biological Attributes entry). Also known as: cerebrospinal fluid E3 ubiquitin-protein ligase RNF13 (human) amount.